Ecto_list is a simple library that helps you manage ordered model with Ecto.

Let's take an example of an ordered model: a Serie which contains an ordered list of videos.

Instead of storing the position of each video in the videos themselves, we will store the ordering in the serie and we will call EctoList.ordered_items_list/2 to return for us the list of items properly ordered.

Read the tutorial to understand the process of installation of the library.

In EctoList.ListItem, you have a set of functions to modify the ordering of your order list. The API is inspired by acts_as_list Ruby gem.

• EctoList.ListItem.insert_at/3
• EctoList.ListItem.move_lower/2 will do nothing if the item is the lowest item
• EctoList.ListItem.move_higher/2 will do nothing if the item is the highest item
• EctoList.ListItem.move_to_bottom/2
• EctoList.ListItem.move_to_top/2
• EctoList.ListItem.remove_from_list/2

• EctoList.ListItem.first?/2
• EctoList.ListItem.last?/2
• EctoList.ListItem.in_list?/2
• EctoList.ListItem.not_in_list?/2
• EctoList.ListItem.higher_item/2
• EctoList.ListItem.higher_items/2 will return all the ids above the given list item id in the order_list
• EctoList.ListItem.lower_item/2
• EctoList.ListItem.lower_items/2 will return all the ids below the given list item id in the order_list

See the demo here.

The documentation can be found here: https://hexdocs.pm/ecto_list.

Feel free to open an issue or a PR if you want to add a new feature. 😁